Noncrystallizing rosin composition and method of producing



Patented May 25, 1937 UNITED STATES PATENT OFFICE N ONCRYSTALLIZIN G ROSIN COMPOSITION AND METHOD OF PRODUCING No Drawing. Application October 7, 1933, Serial No. 692,704

10 Claims.

My invention relates to a non-crystallizing rosin composition and to a method of producing the same.

It is well known that certain types of rosin,

especially wood rosin, although amorphous in character when first produced, tend to crystallize upon standing. When such rosins are included in various compositions, for example, in core oils used in foundries for preparing moulds, in

printers inks, in paper sizes, and the like, the rosin may crystallize and hence greatly impair the quality of the composition.

Now, I have found that by the addition of relatively small quantities of synthetic resins to such rosin compositions, I can eliminate or greatly reduce the tendency of the rosin to crystallize.

I prefer to use for this purpose synthetic resins having a high molecular weight, that is to say, a

molecular weight above 200, as, for example, the

various polyhydric alcohol-polybasic acid resins,

terpinene-maleic anhydride resin, terpinolenemaleic anhydride resin, dipentene-maleicanhydride resin, pinene-maleic anhydride resin, abietic acid-maleic anhydride resin, methyl abietatemaleic anhydride resin, or the like. The polymrdric alcohol-polybasic acid resinsemployed may be either of the so-called simple" type, or they may be modified with various known modifying agents such as drying oils, fatty acids, resin acids,

or the like. Mixtures of the various resins may be employed if desired.

The various terpene-maleic anhydride resins as terpinene-maleic anhydride resin, terpinolenemaleic anhydride resin, dipentene-maleic anhydride resin, pinene-maleic anhydride resin, or

the like, may be prepared by heating the respective terpenes with maleic anhydride, as, for example, is more fully disclosed in the application for United States Patent of Ernest G. Peterson 40 and Edgar R. Littmann, Ser. No. 496,560, filed November 18, 1930 now Patent 1,993,025, and of Ernest 6. Peterson, Serial No. 683,627, filed August 4, 1933 now Patent 1,993,031.

I'prefer to incorporate these synthetic resins into any given rosin composition by first thoroughly blending the rosin with the synthetic resin to be used and then forming the composition from the rosin so treated in the usual manner for its formation. However, I may add the synthetic resin to be used along with other ingredients of the rosin composition without first blending the rosin and the synthetic resin. The synthetic resin will desirably be used in amount less than 49% of the weight of rosin in a composition, the amount used in any given case depending upon the type (Cl. MIG-22) of resin employed and upon the nature of the composition in which the rosin is to be utilized. variously, resin in amount within about the range 0.01-% of the weight of rosin will be found satisfactory, depending upon the use for which any given composition is intended. Again, not exceeding about- 25% of resin will be sufficient. As an example, in the manufactlure of a core oil it is desirable to use from 0.25% to 1% of synthetic resin based on the amount of rosin employed.

As illustrative f the practical embodiment of my invention, I may prepare a core oil unusually resistant to crystallization by combining 40 parts of FF wood rosin, 30 parts of linseed oil, 30 parts of kerosene, and 1 part of terpinene-maleic anhydride. The core oil so produced will be free from crystals after standing for 44 days, while a similar core oil containing no terpinene-maleic anhydride whatever will crystallize in about '7 days.

In place of the terpinene-maleic anhydride in the above example, I may use, for example, terpinolene-maleic anhydride resin, dipentine-maleic anhydride resin, pincne-maleio anhydride resin, or the like, or I may use a simple polyhydric alcohol-polybasic acid resin such as a giycol-phthalic anhydride resin, or a modified polyhydric alcoholpolybasic acid resin such as a glycerol-phthalic anhydride-rosin resin, glycerol-phthalic anhydride stearic acid resin, glycerol-phthalic anhydride perilla oil resin, or glycerol-phthalic anhydride-linoleic acid resin. Some of these resins may not be completely soluble in the constituents of the rosin composition but they will be sufliciently soluble therein to effectively inhibit crystallization and any insoluble portion may be removed from the composition if desired by filtration or centrifuging. In place of synthetic resins made from phthalic anhydrides, I may, of course, use synthetic resins made from any other polybasic organic acid.

As further illustrative of the practical adaptation of my invention, I may produce a non-crystallizing rosin composition by heating rosin with from 0.01 to 49% of any of the synthetic resins described above until they are completely blended together. This rosin so treated is substantially non-crystallizing and may then be employed as such, or in the usual manner in the manufacture of various compositions such as core oils, printing inks, paper sizes, and the like, to produce a noncrystallizing material. I prefer to employ this procedure rather than to merely include the synthetic resin along with the other ingredients of the rosin composition as in the first example given Patent No. 2,081,889.

of the above numbered patent requiring correction as follows: second column,

above, since a more intimate mixing with the rosin is obtained and accordingly a more eflective prevention of crystallization.

It will'be apparent that the product in accordance with my invention involves broadly a composition containing rosin and a relatively small thetic resin with or without the presence or addition oi other ingredients.

The compositions in accordance with my invention will be found to be superior to other rosin compositions in that they are greatly more resistant to crystallization but are otherwise substantially identical with untreated compositions, since the small amount of synthetic resin employed will not alter other properties of the composition.

What I claim and desire to protect by Letters Patent is:

1. A substantially non-crystallizing rosin product comprising a normally crystallizable rosin containing in intimate physical admixture ,a synthetic resin in amount of from about 0.25% to about 1% by weight of the rosin.

2. A substantially non-crystallizing rosin product comprising a normally crystallizable rosin containing in intimate physical admixture a synthetic resin having a molecular weight of more than 200 in amount of from about 0.25% to about by weight of the rosin.

3. A substantially non-crystallizing rosin product comprising a normally crystallizable rosin containing in intimate physical admixture a polyhydric alcohol-polybasic acid resin in amount of from about 0.25% to about 1% by weight of the rosm.

4. A substantially non-crystallizing rosin product comprising a normally crystallizable rosin containing in intimate physical admixture a terpene-maleic anhydride resin in amount of from about 0.25% to about 1% by weight of the rosin.

5. The method of making a substantially noncrystallizing rosin composition which includes intimately mixing a normally crystallizable rosin with a synthetic resin, the synthetic resin being present in amount of from about 0.25% to about 1% by weight of the rosin.

6. A substantially non-crystallizing rosin product substantially identical with a normal rosin except for a reduced tendency to crystallize, comprising a normally crystallizable rosin containing in intimate physical admixture a synthetic resin in amount sufllcient to substantially prevent crystallization of, a, rosin acid from the rosin. I

7. A substantially non-crystallizing rosin product substantially identical with a normal rosin except for a reduced tendency to crystallize, comprising a normally crystallizable rosin containing in intimate physical admixture a synthetic resin having a molecular weight of more than 200 in amount suiiicient to substantially prevent crystallization of a rosin acid from the rosin.

8. A substantially non-crystallizing rosin product substantially identical with a normal rosin except for a reduced tendency to crystallize, comprising a normally crystallizable rosin containing in intimate physical admixture a poiyhydric alcohol-polybasic acid resin in amount suflicient to substantially prevent crystallization of a rosin acid from the rosin.

9. A substantially non-crystallizing rosin product substantially identical with a normal rosin except for a reduced tendency to crystallize, comprising a normally crystallizable rosin containing in intimate physical admixture a terpene-maleic anhydride resin in amount suflicient to substantially prevent crystallization of a rosin acid from the rosin.

10. The method of making a substantially noncrystallizing rosin product which includes intimately mixing a synthetic resin with a normally crystallizable rosin, the synthetic resin being employed in amount suflicient to substantially prevent crystallization of a rosin acid from the rosin but insuiilcient togive to the rosin product properties otherwise substantially different from those of a normal rosin.

JOSEPH N. BORGLIN.

CERTIFICATE OF CORRECTION.

JOSEPH N. BORGLIN.

It is hereby certified that error appears in-the printed specification Page 1,

line 8, for "'manufactlure" read manufacture; line 23, for" "dipentine-maleic" read dipentene-maleic; and that the said Letters Patent should be read with these corrections therein that the same may conform to the recor d of the case in the Patent Office.

Signed and sealed this 20th day of- July, A. D. 1937.

Henry Van Arsdale Acting Commissioner of Patents Patent No. 2,081,889.

of the above numbered patent requiring correction as follows: second column,

above, since a more intimate mixing with the rosin is obtained and accordingly a more eflective prevention of crystallization.

It will'be apparent that the product in accordance with my invention involves broadly a composition containing rosin and a relatively small thetic resin with or without the presence or addition oi other ingredients.

The compositions in accordance with my invention will be found to be superior to other rosin compositions in that they are greatly more resistant to crystallization but are otherwise substantially identical with untreated compositions, since the small amount of synthetic resin employed will not alter other properties of the composition.

What I claim and desire to protect by Letters Patent is:

1. A substantially non-crystallizing rosin product comprising a normally crystallizable rosin containing in intimate physical admixture ,a synthetic resin in amount of from about 0.25% to about 1% by weight of the rosin.

2. A substantially non-crystallizing rosin product comprising a normally crystallizable rosin containing in intimate physical admixture a synthetic resin having a molecular weight of more than 200 in amount of from about 0.25% to about by weight of the rosin.

3. A substantially non-crystallizing rosin product comprising a normally crystallizable rosin containing in intimate physical admixture a polyhydric alcohol-polybasic acid resin in amount of from about 0.25% to about 1% by weight of the rosm.

4. A substantially non-crystallizing rosin product comprising a normally crystallizable rosin containing in intimate physical admixture a terpene-maleic anhydride resin in amount of from about 0.25% to about 1% by weight of the rosin.

5. The method of making a substantially noncrystallizing rosin composition which includes intimately mixing a normally crystallizable rosin with a synthetic resin, the synthetic resin being present in amount of from about 0.25% to about 1% by weight of the rosin.

6. A substantially non-crystallizing rosin product substantially identical with a normal rosin except for a reduced tendency to crystallize, comprising a normally crystallizable rosin containing in intimate physical admixture a synthetic resin in amount sufllcient to substantially prevent crystallization of, a, rosin acid from the rosin. I

7. A substantially non-crystallizing rosin product substantially identical with a normal rosin except for a reduced tendency to crystallize, comprising a normally crystallizable rosin containing in intimate physical admixture a synthetic resin having a molecular weight of more than 200 in amount suiiicient to substantially prevent crystallization of a rosin acid from the rosin.

8. A substantially non-crystallizing rosin product substantially identical with a normal rosin except for a reduced tendency to crystallize, comprising a normally crystallizable rosin containing in intimate physical admixture a poiyhydric alcohol-polybasic acid resin in amount suflicient to substantially prevent crystallization of a rosin acid from the rosin.

9. A substantially non-crystallizing rosin product substantially identical with a normal rosin except for a reduced tendency to crystallize, comprising a normally crystallizable rosin containing in intimate physical admixture a terpene-maleic anhydride resin in amount suflicient to substantially prevent crystallization of a rosin acid from the rosin.

10. The method of making a substantially noncrystallizing rosin product which includes intimately mixing a synthetic resin with a normally crystallizable rosin, the synthetic resin being employed in amount suflicient to substantially prevent crystallization of a rosin acid from the rosin but insuiilcient togive to the rosin product properties otherwise substantially different from those of a normal rosin.

JOSEPH N. BORGLIN.

CERTIFICATE OF CORRECTION.

JOSEPH N. BORGLIN.

It is hereby certified that error appears in-the printed specification Page 1,

line 8, for "'manufactlure" read manufacture; line 23, for" "dipentine-maleic" read dipentene-maleic; and that the said Letters Patent should be read with these corrections therein that the same may conform to the recor d of the case in the Patent Office.

Signed and sealed this 20th day of- July, A. D. 1937.

Henry Van Arsdale Acting Commissioner of Patents 

